121605556 has 24 divisors (see below), whose sum is σ = 225670536. Its totient is φ = 57139200.

The previous prime is 121605527. The next prime is 121605563. The reversal of 121605556 is 655506121.

It can be written as a sum of positive squares in 4 ways, for example, as 41216400 + 80389156 = 6420^2 + 8966^2 .

It is a super-2 number, since 2×121605556² = 29575822500138272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75156 + ... + 76756.

It is an arithmetic number, because the mean of its divisors is an integer number (9402939).

Almost surely, 2^121605556 is an apocalyptic number.

It is an amenable number.

121605556 is a deficient number, since it is larger than the sum of its proper divisors (104064980).

121605556 is a wasteful number, since it uses less digits than its factorization.

121605556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739 (or 2737 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 121605556 is about 11027.4909204225. The cubic root of 121605556 is about 495.4324771892.

The spelling of 121605556 in words is "one hundred twenty-one million, six hundred five thousand, five hundred fifty-six".